Coffee machine



FIG. 1 is an upper perspective view of the coffee machine showing my design.

FIG. 2 is a side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is an opposite side view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof. 

I claim the ornamental design for a coffee machine, as shown and described. 